Best Includes Source SDK Games on Steam

Name Release Date Current Players All-Time Peak Rating
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 42 184 56 655 96.74
Garry's Mod Garry's Mod 29 Nov, 2006 26 110 38 330 96.02
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 11 934 14 522 95.07
Half-Life 2 Half-Life 2 16 Nov, 2004 1 512 3 630 96.37
Portal Portal 10 Oct, 2007 1 408 1 811 97.16
Left 4 Dead Left 4 Dead 17 Nov, 2008 953 1 651 94.58
No More Room in Hell No More Room in Hell 31 Oct, 2013 854 970 88.54
Black Mesa Black Mesa 6 Mar, 2020 751 1 968 93.94
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 314 677 89.58
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 289 664 92.70
Half-Life 2: Episode Two Half-Life 2: Episode Two 10 Oct, 2007 239 530 95.10
Half-Life 2: Episode One Half-Life 2: Episode One 1 Jun, 2006 202 517 93.64
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 170 308 69.83
Fistful of Frags Fistful of Frags 9 May, 2014 155 206 89.65
Selaco Selaco 30 May, 2024 141 1 104 88.61
Astro Colony Astro Colony 7 Nov, 2022 138 742 79.73
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 117 274 88.42
Zombie Panic! Source Zombie Panic! Source 3 Oct, 2008 36 74 82.30
Battle Grounds III Battle Grounds III 30 Jun, 2019 23 69 82.68
Day of Infamy Day of Infamy 23 Mar, 2017 15 59 81.05
Absorber Absorber 9 Jul, 2023 12 70 69.86
BrainBread 2 BrainBread 2 9 Mar, 2022 10 25 71.49
Pirates, Vikings, and Knights II Pirates, Vikings, and Knights II 12 Feb, 2010 6 56 85.05
Sunrise: survival Sunrise: survival 3 Aug, 2017 4 19 49.83
Rise of the Triad Rise of the Triad 31 Jul, 2013 4 23 64.52
Kingdom of Atham: Crown of the Champions Kingdom of Atham: Crown of the Champions 12 Jan, 2024 3 26 73.97
Kreedz Climbing Kreedz Climbing 15 Jun, 2017 3 10 78.35
Double Action: Boogaloo Double Action: Boogaloo 23 Oct, 2014 2 27 90.35
Empires Mod Empires Mod 28 Jul, 2008 1 57 81.83
Dino Hazard: Chronos Blackout Dino Hazard: Chronos Blackout 22 Dec, 2023 1 10 80.05
Attack on Titan - Costume Set - Halloween Attack on Titan - Costume Set - Halloween 25 Oct, 2016 0 0 0.00
Apartament 1406: Horror Demo Apartament 1406: Horror Demo 25 Aug, 2023 0 0
Synergy Synergy 3 Oct, 2008 0 0 88.30
CommunityUs CommunityUs Coming soon 0 0
Entropy : Zero 2 Entropy : Zero 2 20 Aug, 2022 0 0
Attack on Titan - Costume Set - Summer Festival Attack on Titan - Costume Set - Summer Festival 26 Aug, 2016 0 0 0.00
Feudal Friends Feudal Friends 17 Jul, 2023 0 501 59.78
Menace from the Deep Menace from the Deep 2024 0 0
THE IMPOSSIBLE Demo THE IMPOSSIBLE Demo 9 Oct, 2020 0 0
Pool Nation FX - Unlock Online Pool Nation FX - Unlock Online 7 Dec, 2015 0 0 66.76
Borderless Gaming - Donation #1 Borderless Gaming - Donation #1 7 Aug, 2015 0 0
AfterImpaKt AfterImpaKt Coming soon 0 0
Pathfinder Adventures - Character Alts 1 Pathfinder Adventures - Character Alts 1 15 Jun, 2017 0 0 0.00
Logistique Act. 1 Logistique Act. 1 12 Sep, 2020 0 0
Pool Nation FX - Unlock Cues Pool Nation FX - Unlock Cues 7 Oct, 2015 0 0 0.00
Emoto Emoto 26 Sep, 2018 0 0 58.33
Evacuation Evacuation 6 Jan, 2023 0 0
Frame of Mind - A game of thoughts. Frame of Mind - A game of thoughts. Q4 2023 0 0
City of Ages: Picture Supportive Text MUD (server and client included) City of Ages: Picture Supportive Text MUD (server and client included) 13 Oct, 2017 0 0 70.08
Party Club Demo Party Club Demo 18 Jun, 2024 0 0
File uploading